Final answer:
The Human Development Index (HDI) includes dimensions of life expectancy, educational attainment, and standard of living, but does not specifically incorporate technology accessibility as a principal dimension.
Step-by-step explanation:
The Human Development Index (HDI) is a measure developed by the United Nations to indicate the level of human development of a country. The HDI incorporates three dimensions: life expectancy, educational attainment, and standard of living. Specifically, the HDI uses indicators such as life expectancy at birth, mean years of schooling, expected years of schooling, and Gross National Income per capita adjusted for purchasing power parity.
Therefore, the answer to the student's question is d) technology accessibility, as it is not included in the three principal dimensions used to calculate the HDI.